1. Prepare the ingredients: measure 1/4 of lemon juice, 1/4 of cherry brandy, 2/4 of cognac and some pineapple cubes for decoration.

2. Prepare the shaker: fill the shaker with some ice cubes.

3. Shake the ingredients: pour the lemon juice, cherry brandy, and cognac into the shaker. Close the shaker tightly and shake vigorously to mix the ingredients.

4. Prepare the glass: take a highball glass and fill it with crushed ice.

5. Pour the cocktail: strain the cocktail from the shaker into the glass already filled with crushed ice.

6. Decorate the cocktail: add some pineapple cubes on the surface of the cocktail for decoration.

7. Serve the Brandy Fix: serve the cocktail immediately and enjoy it cold.